/**
 * Copyright 2007-2008 Vidar Svansson
 *     
 * This file is part of JAdapter.
 * 
 * JAdapter is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * JAdapter is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with JAdapter.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.jadapter.graph;

import org.jadapter.Query;

/**
 * 
 * @author Vidar Svansson
 * @since 0.1
 *
 * @param <T>
 * @param <U>
 */
public class TransitiveClosure<T,U> extends Graph<T, Query<U>> {

	@Override
    public final void insert(T x, T y, Query<U> edge) {
        if (put(x,y, edge)) {            
            for (T t : from(y)) {
                Query<U> u = get(y, t);
                put(x,t, edge.prepend(u));
            }
            for (T t : to(x)) {
                Query<U> u = get(t, x);
                put(t,y, edge.append(u));
            }
        }              
    }

}
